DROP BASED VISUAL FLUOROMETRY OF ALUMINUM AT PPB LEVEL WITH 2,2'-DIHYDROXYAZOBENZENE BY USING OCTADECYLSILANIZED SILICA THIN-LAYER

A new visual fluorometry for trace aluminium has been developed. The m ethod is based on specific immobilization of its chelate with 2,2'-dih ydroxyazobenzene (H2L) on an octadecylsilanized silica thin layer. An aqueous sample drop was evaporated into a fleck on the water-repellent surface, and chromatography was performed with acetone. The fluoresce nt chelate, [AlL](+), remained at the spotting position, whereas the o ther chelates were eluted to a position close to the solvent front.